# Subaru Telescope Primary Mirror In-Situ Measured Reflectivity # Coated with Aluminum on 2022-08-04 # Opened the vacuum chamber on 2022-08-08 # Measured with Subaru Portable Spectrophotometer (SPS) on 2026-05-28 (1393 days after) # Measured three times at around the position 3 # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) Pos.3 #1 Pos.3 #2 1000 83.69 84.40 84.39 998 84.43 83.74 83.82 996 84.37 83.72 83.38 994 83.62 83.87 84.65 992 84.41 83.86 83.81 990 84.23 83.98 83.80 988 83.23 84.17 83.98 986 83.18 84.15 84.35 984 83.85 83.99 84.70 982 84.15 83.53 84.63 980 84.26 83.70 84.17 978 83.45 83.46 83.48 976 83.87 84.59 82.73 974 83.52 83.54 83.40 972 83.27 84.12 83.13 970 83.80 83.06 83.89 968 83.29 83.96 83.27 966 83.60 83.91 83.19 964 83.35 83.45 83.62 962 83.26 83.19 83.57 960 83.85 82.93 83.15 958 83.68 83.04 83.18 956 82.67 83.36 83.31 954 83.38 83.15 82.84 952 82.35 82.44 82.60 950 82.78 83.26 82.83 948 82.55 82.43 82.81 946 82.51 82.89 82.64 944 82.63 82.44 82.76 942 82.73 82.12 82.45 940 82.59 82.35 82.29 938 81.84 82.25 82.48 936 81.87 81.98 82.35 934 82.13 81.94 82.13 932 81.84 82.10 82.03 930 82.28 81.57 81.56 928 81.64 81.36 81.49 926 81.45 81.66 81.33 924 81.39 81.37 81.65 922 81.31 81.63 81.38 920 81.37 81.48 81.05 918 81.16 81.39 80.44 916 80.81 80.78 80.93 914 81.24 80.87 81.09 912 80.74 80.88 80.39 910 80.42 80.50 80.51 908 80.25 80.41 80.26 906 80.03 80.10 80.59 904 80.21 79.95 80.19 902 79.74 80.06 79.98 900 79.41 80.06 80.14 898 80.03 80.16 79.76 896 79.58 79.81 79.80 894 79.69 79.73 79.29 892 79.28 79.31 79.19 890 79.00 79.08 79.54 888 79.18 78.89 79.23 886 79.18 78.91 78.78 884 78.63 78.91 78.65 882 78.55 78.64 78.53 880 78.13 78.72 78.07 878 78.33 78.92 78.13 876 78.06 78.43 77.98 874 77.79 78.22 77.46 872 78.09 77.50 77.76 870 78.05 77.70 77.80 868 77.66 77.29 77.58 866 77.67 77.59 77.01 864 77.32 77.08 77.12 862 77.49 77.29 76.80 860 76.99 77.56 77.16 858 76.96 76.87 76.67 856 76.69 76.54 76.65 854 76.65 76.69 76.77 852 76.33 76.48 76.54 850 76.39 76.78 76.59 848 76.30 76.00 76.60 846 76.38 76.47 76.14 844 76.38 76.39 75.91 842 76.57 76.46 76.23 840 76.48 76.23 76.27 838 76.11 76.12 75.76 836 76.17 75.84 75.55 834 75.92 75.87 76.38 832 75.76 75.81 75.69 830 76.11 76.08 76.03 828 76.04 76.13 75.65 826 76.25 75.77 75.65 824 75.96 75.30 75.52 822 76.17 75.84 75.93 820 76.01 76.14 75.89 818 75.88 76.03 75.90 816 75.86 75.99 76.16 814 75.91 75.97 76.05 812 76.00 76.27 76.15 810 76.01 76.33 76.01 808 76.19 76.36 76.10 806 76.31 76.18 76.38 804 76.15 76.38 76.00 802 76.28 76.60 76.10 800 76.85 76.39 76.11 798 76.63 76.69 76.34 796 76.30 76.30 76.43 794 76.57 76.59 76.43 792 76.54 76.92 76.48 790 77.04 76.43 76.37 788 77.21 76.80 76.77 786 76.65 76.84 76.77 784 77.25 76.78 76.72 782 77.20 76.98 76.56 780 76.82 77.12 76.65 778 77.03 77.19 76.91 776 76.98 77.43 76.92 774 77.33 77.52 77.30 772 77.44 77.10 77.20 770 77.45 77.28 77.01 768 77.81 77.74 77.14 766 77.73 77.39 77.55 764 77.69 77.69 77.28 762 77.49 78.01 77.84 760 77.89 77.61 77.50 758 77.74 77.81 77.44 756 78.00 77.80 77.91 754 77.77 77.85 77.82 752 78.28 77.99 77.80 750 78.14 78.15 77.96 748 78.25 78.18 77.99 746 78.40 78.30 77.98 744 78.41 78.36 78.11 742 78.05 78.20 78.10 740 78.49 78.31 78.17 738 78.52 78.31 78.27 736 78.60 78.66 78.12 734 78.54 78.34 78.24 732 78.43 78.68 78.33 730 78.79 78.65 78.50 728 78.53 78.38 78.40 726 78.71 78.70 78.41 724 79.04 78.59 78.37 722 78.79 78.82 78.64 720 79.08 78.91 78.69 718 79.11 78.80 78.72 716 78.90 78.85 78.63 714 79.00 79.05 78.80 712 79.04 78.76 78.93 710 79.16 78.88 78.68 708 79.15 79.06 78.76 706 79.00 79.04 78.69 704 79.22 79.31 78.86 702 79.14 79.11 78.83 700 79.16 79.04 78.82 698 79.36 79.12 78.93 696 79.34 79.27 78.68 694 79.20 79.24 78.98 692 79.58 79.10 79.06 690 79.22 79.43 78.87 688 79.22 79.31 78.93 686 79.72 79.11 79.05 684 79.42 79.23 79.02 682 79.60 79.57 79.28 680 79.43 79.37 79.10 678 79.55 79.33 79.22 676 79.34 79.40 79.17 674 79.58 79.65 79.06 672 79.48 79.43 79.09 670 79.66 79.48 79.08 668 79.70 79.53 79.23 666 79.65 79.68 79.34 664 79.46 79.50 79.43 662 79.72 79.40 79.51 660 79.62 79.39 79.48 658 79.57 79.62 79.10 656 79.82 79.73 79.30 654 79.80 79.55 79.22 652 79.70 79.56 79.24 650 79.74 79.50 79.54 648 79.82 79.54 79.35 646 79.91 79.50 79.28 644 79.81 79.71 79.38 642 79.96 79.78 79.39 640 79.78 79.53 79.48 638 79.84 79.60 79.54 636 79.77 79.65 79.49 634 79.72 79.52 79.45 632 79.86 79.96 79.52 630 79.74 79.88 79.39 628 79.67 79.70 79.42 626 79.77 79.79 79.61 624 79.82 79.82 79.38 622 79.88 80.04 79.32 620 79.77 80.06 79.48 618 79.94 79.55 79.47 616 79.76 79.66 79.49 614 79.91 79.72 79.52 612 79.82 79.70 79.63 610 79.92 79.77 79.42 608 80.02 79.81 79.46 606 79.96 79.72 79.47 604 79.81 79.78 79.47 602 79.89 79.72 79.21 600 79.84 79.89 79.47 598 79.75 79.70 79.33 596 79.84 79.84 79.36 594 79.93 79.79 79.37 592 79.80 79.66 79.42 590 79.66 79.71 79.38 588 79.87 79.77 79.42 586 79.95 79.64 79.40 584 79.76 79.78 79.56 582 79.79 79.85 79.31 580 80.01 79.60 79.47 578 79.99 79.72 79.34 576 79.91 79.54 79.34 574 79.85 79.80 79.34 572 79.94 79.82 79.42 570 79.74 79.68 79.24 568 79.98 79.53 79.31 566 79.78 79.99 79.42 564 79.83 79.66 79.57 562 79.84 79.81 79.38 560 79.95 79.58 79.25 558 79.79 79.79 79.27 556 79.79 79.82 79.21 554 79.76 79.86 79.10 552 79.80 79.63 79.13 550 79.64 79.87 79.31 548 79.80 79.67 79.44 546 79.75 79.70 79.18 544 79.57 79.63 79.26 542 79.77 79.44 79.28 540 79.62 79.29 79.06 538 79.66 79.57 79.08 536 79.62 79.61 79.11 534 79.73 79.90 79.38 532 79.70 79.57 79.11 530 79.60 79.44 79.00 528 79.60 79.56 78.93 526 79.68 79.37 79.30 524 79.50 79.53 79.12 522 79.64 79.56 79.09 520 80.05 79.51 78.96 518 79.80 79.52 78.91 516 79.71 79.43 78.93 514 79.65 79.39 78.91 512 79.32 79.34 78.85 510 79.58 79.20 79.10 508 79.67 79.30 78.89 506 79.36 79.23 78.91 504 79.62 79.30 78.99 502 79.40 79.30 78.97 500 79.34 79.17 78.94 498 79.47 79.25 78.99 496 79.38 79.15 79.09 494 79.48 79.07 79.06 492 79.49 79.34 79.06 490 79.38 79.03 78.65 488 79.50 79.10 78.61 486 79.35 78.89 78.57 484 79.32 79.09 78.77 482 79.28 79.13 78.39 480 79.39 78.82 78.85 478 79.20 78.90 78.63 476 79.29 78.93 78.67 474 79.50 78.97 78.84 472 79.44 78.97 78.64 470 79.15 78.66 78.44 468 79.09 78.61 78.33 466 78.82 78.93 78.56 464 79.14 78.90 78.18 462 79.00 78.84 78.37 460 79.26 78.87 78.22 458 79.08 78.85 78.26 456 79.13 78.63 78.20 454 78.73 78.46 78.12 452 78.75 78.40 78.24 450 78.82 78.23 78.36 448 79.05 78.23 78.08 446 78.84 78.18 78.08 444 78.79 78.54 78.23 442 79.02 78.22 78.49 440 78.77 78.33 78.02 438 79.15 78.32 77.81 436 79.14 78.36 78.31 434 78.94 78.25 77.87 432 78.66 78.36 78.06 430 78.66 77.97 77.81 428 79.04 77.97 77.81 426 78.44 78.53 77.67 424 78.90 78.13 78.08 422 78.08 78.28 77.92 420 78.62 78.08 77.85 418 78.27 78.03 77.52 416 78.47 77.96 77.65 414 78.39 77.60 77.63 412 78.24 77.74 76.76 410 77.46 77.99 77.26 408 77.97 78.04 77.35 406 77.87 77.65 76.84 404 78.40 77.76 76.88 402 78.12 77.19 76.46 400 77.41 76.76 77.31 398 77.83 77.28 77.27 396 76.19 77.12 75.94 394 77.55 77.43 76.69 392 77.60 77.01 77.24 390 77.21 76.81 76.61 388 77.46 76.99 76.94 386 76.96 77.50 77.12 384 77.07 77.17 75.96 382 77.11 75.95 75.35 380 76.80 76.14 76.14 1650 88.70 88.94 88.77 1640 88.71 88.95 88.80 1630 88.73 88.96 88.78 1620 88.71 88.96 88.79 1610 88.71 88.97 88.78 1600 88.69 88.95 88.77 1590 88.69 88.94 88.76 1580 88.67 88.93 88.74 1570 88.66 88.91 88.74 1560 88.65 88.92 88.72 1550 88.63 88.88 88.70 1540 88.61 88.88 88.67 1530 88.60 88.85 88.67 1520 88.58 88.85 88.63 1510 88.56 88.81 88.62 1500 88.54 88.80 88.59 1490 88.52 88.78 88.57 1480 88.50 88.76 88.55 1470 88.48 88.73 88.52 1460 88.45 88.71 88.50 1450 88.43 88.68 88.47 1440 88.40 88.66 88.44 1430 88.37 88.63 88.41 1420 88.35 88.60 88.39 1410 88.33 88.57 88.35 1400 88.29 88.54 88.32 1390 88.26 88.50 88.28 1380 88.23 88.47 88.25 1370 88.20 88.43 88.21 1360 88.17 88.40 88.18 1350 88.15 88.38 88.16 1340 88.12 88.35 88.13 1330 88.09 88.31 88.09 1320 88.05 88.28 88.05 1310 88.00 88.24 88.02 1300 87.97 88.19 87.98 1290 87.92 88.15 87.94 1280 87.88 88.11 87.89 1270 87.85 88.06 87.83 1260 87.81 88.01 87.79 1250 87.75 87.95 87.73 1240 87.70 87.90 87.68 1230 87.65 87.84 87.64 1220 87.59 87.78 87.57 1210 87.54 87.73 87.50 1200 87.48 87.65 87.44 1190 87.41 87.58 87.37 1180 87.34 87.51 87.28 1170 87.27 87.43 87.23 1160 87.20 87.35 87.15 1150 87.11 87.27 87.05 1140 87.02 87.18 86.97 1130 86.94 87.09 86.89 1120 86.83 87.00 86.79 1110 86.74 86.87 86.67 1100 86.62 86.78 86.57 1090 86.51 86.65 86.45 1080 86.38 86.50 86.30 1070 86.23 86.36 86.16 1060 86.08 86.21 86.02 1050 85.93 86.04 85.84 1040 85.74 85.85 85.67 1030 85.55 85.65 85.47 1020 85.34 85.45 85.24 1010 85.10 85.21 85.03 1000 84.83 84.94 84.77 990 84.57 84.67 84.47 980 84.25 84.34 84.16 970 83.91 84.00 83.80 960 83.51 83.60 83.39 950 83.07 83.14 82.96